Cutter chain



c. E. DA'vls CUTTER .CHAIN Filed March 17,-. "192:5 2 sheets-snee; 1

Oct. 4 1927.

l 2 Sheets-Sheet 2 Filed Maron 17 192s Patented Octe 4, 19217'.

UNITED S'Ihli'l'lklS `PfrliNT oFFlcE.

CHARLES E. DAVIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO GOODMAN MANUFACTURING- COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS. i

CUTTER CHAIN.

Application filed March 17, 1923.v Serial No. 625,909.

This invention relates to improvements in cutter chains for mining machines, and more particularly to cutter lblocks for holding the cutter bits, and has for its principal object to produce a simple and durL ble construction of cutter blocks ofthe class described.

Y My invention may be bestunders'tood by reference to the accompanying drawings in which:

Figure 1 is a side view of a cutter chain block embodying my invention.

Y Figure 2 is an enlarged view in perspective of thev reverse side of the cutter chain block shown in'Figure 1.

Figure 3 is a sectional view of the chain showingit in position in a cutter head of a mining machine.

Figure 4; is a sect-ion taken on line 1 4 of Figure 1.

Figure 5 Figure 1.

Figure 6 is a side view of a forged or cast blank for the cutter block before machining the bit-receiving recess. Y

Figure 7 is a view similar to Figure 6, after machining the bit-receiving recess.

The principal function of a cutter chain block is to support the cutter bit securely in position to engage the material to be cut. The cutter bits project outwardly at various angles to the blocln'as shown in Figure 3, and are subject to enormous rearward and lateral stresses during the cutting operation, which often causes the bit to work loose in its securing device even when tightened as much as practicable by the usual methods The most satisfactoryv form of securing device now in general use includes an aperture formed in the top of the block, into which the cutter bit is inserted endwise. The bit is a section taken on line 5-5 of is clamped against the rear wall of the apex,

ture, by various means, such as set screws or their equivalents.

One obl'ectionable feature of the ordinary form of block is that the cutter bits often get wedged in the aperture, making it very diiiicult to remove them, especially when the outer end is broken of. Furthermore, such blocks are more or less difficult to manufacture in an efficient and economical manner, as for example, when such blocks are formed of castings it is necessary either to core an aperture for the cutter bit or machine such an aperture after the casting. is formed. Gering is troublesome becauw7 @if the difficulty inmaintaining uniformityfin size and smoothness in the aperture, so as to provide the desired fit Afor the bit. In the case of forged cutter blocks kof this type it 1s necessary to drillor broach, or both drill and broach this aperture in the forged blank.

'In the present invention, the block is provided with an elongated groove, openingto one side thereof, and having a 'clamping de` vice for holding a bit in this groove. The blank for the improvedk form of blockmay be forged orcast, andthe bit retainingv groove may be finished with a minimum amount of machining by means of a milling rcutter or the like. y proved form of clamp for holding the cutter bit in place, and means for protecting the parts ofthe clamp' from abrasion during the cutting operation.

drawings, the cutter chain comprises a series of blocks 10, suitably provided with holes 11a, 11a, `invwhich links 11, 11 are connected in the usual manner. The cutter blocks are I Valso provide anrim- 4 v r76 Referring now to the details shown in the each provided witha base having a pair of with a vcutter bit 16', and thel bits are arranged at various angles'respective to the cutter head 13. In Flgure 3, Seven such angles or positions ofk the cutter bits are shown. which extend beyond vthe cutter head 13 are also arranged at various angles to 'correspond with their respective cutter bits 16. The general construction of the cutter blocks are the same, however, so that a description of one applies to all. Y

' The body 15 of the cutter block 10 is provided with a lateral opening recess or groove 17 extending from the restraining lip 12 and between the holes 11a, 11a outwardly along one side to the outer edge or top of the block. This groove 17 is preferably formed with a relatively restricted portion 17 a adjacent rthe outer end, and a relatively'wider and deeper portion 17b adjacent the innerY end thereof, atthe base of the block. The restricted portion l17EL of the groove is finished to receive the cutter bit 16 therein by machining along the sides and bottom therecf, as shown in Figures 6 and. *L The larger The portions of the cutter blocks portion 171 is 'preferablyjof sufii'cient Width and depth to afford a clearance around the bit when it is in place in the machined gro'ov'e portion 17% as shown in Figure 5, so as to permit the bit to be readily removed from the block.

The bit is secured in place by a clamping member 18 having a portion thereof projecting over the open side of the groove 17 and having engagement with the exposed side of the cutter bit 16. The coacting Surfaces of the cutter bit 16 and the clamping member 18 are .preferablyV milled as indicated at 19 to provide a firm grip for the cutter bit. The clamping member 18 is integral vvith a bolt 20 extending through the body 15 of the block and having a nut 21 threaded thereon to engage the oppositeA side of said block.v In order to protect this nut from abrasion a lateral projection 22 is formed 'on the block forwardly of said nut. In the form shoivn this cut-ter bit 16 is inclined forwardly of the block, but it will be understood that the novel features of my invention may be applied to blocks having the bit arranged at` any desired angle therein. Y

`Although I have shown and described one form in Which my invention may be embodied,- it Will be understood that the construction and arrange-ment of the part-s may vary Widely l,Without departing from the -spiritand scope of my invention. I do not therefore Wish to be understood as limiting myself tothe specific construction illustrated herein excepting as specifically limited in -the appended claims.

I claim as my invention:

1. In combination with a cutter bit, a chain block comprising a body vprovided with 'a recess opened throughout its length to one side of said body and adapted to receive said bit in lateral engagement therein, a clamping device extending transversely through said body for retaining said bit in said recess, a nut having threaded engagement with said clamping device on the opposite side of said body for adjusting the tension of said clamping device, and ay projectionon said body forwardly of said nutl for protecting the latter from abrasion.

2. In combination With a cutter 7bit, a chain block` comprising an elongated base provided With a laterally projecting lug, and a body portion extending outwardly from said base, said block having a bit ref ceivi-ng Vrecessopening to one side'of said base and body, the outer portion of said r'e- Celis being relatively restricted to receive said bit in lateral bearing engagement, and the inner portion 4of said recess adjacent said lug being relatively larger to afford clear'L ance about said bit, and a clamping device for securing said bit in said recess. j

3. In combination lwith ay cutter bit, a chain block comprisingV an elongated base and a body portion extending outwardly from said base, said block lhaving Va bit receiving recess opening to one side of lsaid base and body, the outer portion of said re- 'cess being relatively restricted to receive said bit in lateral bearing engagement, and Vthe inner portion of said recess being relatively larger to afford clearance about said bit, and a clamping device for securingsaid bit in said recess. l

Signed at Chica-go, in the county of Cook and State of Illinois, this 13th .day of -March,1923. Y j

' CHARLES DAVIS. 

